code: def test_get_method(self):
      obj = constraints.get("unit_norm")
      self.assertTrue(obj, constraints.UnitNorm)
  
      obj = constraints.get(None)
      self.assertEqual(obj, None)
  
      with self.assertRaises(ValueError):
          constraints.get("typo")
  
file_path: keras/keras/constraints/constraints_test.py
imports: import numpy
  from keras import backend
  from keras import constraints
  from keras import testing
label_desc: Use image node_id 5 for calling the ConstraintsTest obj's underlying member method code with example usage: obj.test_get_method() without return types